本論文探討分析石化廠汽電共生系統運轉特性，模擬系統之電力潮流、故障電流及系統穩定度分析，以符合台電汽電共生並聯技術作業要點與工廠運轉穩定性需求。本文透過電力暫態分析軟體ETAP建立石化廠及轄區69kV系統，經由電力潮流分析結果了解系統在輕載及重載運轉時電壓及功率變化，以及石化廠與台電責任分界點之功率因數是否符合規定。故障電流探討了解三相故障電流是否超過斷路器(Circuit Breaker, CB)的啟斷容量，以確保事故發生後，斷路器能確實隔離故障。系統穩定度分析包含廠外事故、廠內事故及系統解聯後汽電廠獨立運轉廠內匯流排與發電機組各種響應，透過故障模擬分析了解各種事故對廠區可能造成的影響，提供石化廠操作及汽電共生系統興建規劃之參考，以增進汽電共生系統操作安全與穩定度。

The aim of this thesis is analyzing petrochemical plants co-generation system operating characteristic by simulating power flow, fault currents and transient stability. In order to meet the Taipower parallel co-generation technical operating guide and operate the petrochemical plant stably, the petrochemical plants and the 69kV power system are established by the power transient analysis software, ETAP. The voltage and power changes at the petrochemical plants and Taipower duty points when the power system is in the light and heavy load will be figured out by analyzing power flow. To avoid the three-phase fault current exceeds the circuit breaker capacity(Circuit Breaker, CB) and to ensure the fault is isolated. The power system analysis is include analyzing the power system stability during the outages occurs inside or outside the factory, and performing the buses or the generators response of co-generation plant after disconnect with Taipower system and then become a regional islanding power system. To figure out the possible impact of the various outages in the plant, the fault simulation analysis is necessary. This thesis provides a method of petrochemical plant operation and a reference of the co-generation system for enhance the security and stability of co-generation system operation in planning of construction.

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